an industrial worker walks around a piece of equipment swinging inside a factory. - 電磁鐵 個影片檔及 b 捲影像00:27
an industrial worker grabs a piece of scrap metal hanging from a large magnet. - 電磁鐵 個影片檔及 b 捲影像00:14
electromagnet disc lowers on chain above pile of metal objects, picks them up and moves toward camera, brick wall in bkgd / note: exact year not... - 電磁鐵 個影片檔及 b 捲影像00:51